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    Researchers developed a flexible, stretchable Micro-Light Emitting Diode (Micro-LED) array using liquid metal electrodes. The device maintains excellent optoelectronic stability under significant strain and bending, showing potential for advanced sensors and phototherapy.

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    Area of Science:

    • Materials Science
    • Electrical Engineering
    • Optoelectronics

    Background:

    • Flexible and stretchable electronics require robust interconnects that maintain electrical integrity during deformation.
    • Micro-Light Emitting Diode (Micro-LED) arrays are crucial for advanced display and sensing technologies but are often limited by substrate rigidity.

    Purpose of the Study:

    • To fabricate a highly stretchable multi-wavelength Micro-LED array device.
    • To investigate the use of liquid metal as 3D interconnect electrodes for flexible electronics.
    • To ensure stable optoelectronic performance under various mechanical deformations.

    Main Methods:

    • Fabrication of a flexible Micro-LED array on an Ecoflex 00-30 substrate.
    • Utilizing liquid metal for 3D interconnect electrodes.
    • Employing simulations to analyze microchannel effects on liquid metal electrodes during strain.
    • Developing complex-shaped dual-layer microchannels using a sacrificial paraffin-wax structure.
    • Optimizing LED pin electrode shape for stable electrical interconnection.

    Main Results:

    • A flexible and stretchable Micro-LED array device with up to 254% maximum strain was successfully fabricated.
    • Simulations confirmed the influence of microchannel structures on liquid metal electrode resistance.
    • The device demonstrated excellent optoelectronic stability, with optical power and current changes below 2.5% and 2.9% respectively during 0-100% strain.
    • Performance remained stable under bending, with changes below 0.5% for a 16 mm bending radius.

    Conclusions:

    • The developed Micro-LED array exhibits remarkable flexibility, stretchability, and optoelectronic stability.
    • Liquid metal interconnects, integrated with optimized microchannel and electrode designs, are effective for highly deformable electronic devices.
    • This technology offers significant potential for applications in phototherapy, flexible sensors, and wearable electronics.